Steel tape detection device
By designing a steel tape measure testing device that includes a temperature control box and an electric heating wire, the problem of testing error caused by the difference in thermal expansion and contraction between the metal standard ruler and the steel tape measure being tested is solved, achieving accurate testing under 20℃ conditions. It is suitable for industries such as construction, machinery manufacturing, and clothing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-19
- Publication Date
- 2026-03-24
AI Technical Summary
Existing steel tape measure testing equipment suffers from inaccurate results due to the difference in thermal expansion and contraction characteristics between the metal standard ruler and the steel tape measure being tested. This is especially true for longer tape measures, which have a greater deviation, affecting the quality and safety of industries such as construction, machinery manufacturing, and clothing.
A steel tape measure testing device was designed, comprising a testing platform, a temperature control box, an electric heating wire, and a cooling fan. By adjusting the temperature of the testing platform to 20°C, and using an auxiliary ruler and vernier for precise testing, the device reduces errors caused by thermal expansion and contraction. A fixture is set up to stabilize the steel tape measure and ensure testing accuracy.
It achieves accurate detection at 20℃, reduces detection errors, and improves the accuracy and stability of steel tape measure detection. It is suitable for industries such as construction, machinery manufacturing, and clothing.
Smart Images
Figure CN224034543U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of metrology equipment testing technology, specifically a steel tape measure testing device. Background Technology
[0002] Steel measuring tapes, as a common measuring tool, are widely used in various industries such as construction, machinery manufacturing, clothing, and surveying. Their measurement accuracy directly affects product quality, engineering safety, and fair trade. During production and use, factors such as processes, materials, and environment can cause accuracy deviations in steel measuring tapes. If these deviations are not inspected, they can lead to safety hazards in construction, improper assembly of mechanical parts, ill-fitting clothing, and inaccurate surveying results, resulting in economic losses, commercial disputes, and even violations of relevant laws and regulations. Existing testing equipment uses standard rulers for comparison. In actual testing, the standard rulers used are all made of metal. As is well known, metal has the property of thermal expansion and contraction. The steel measuring tapes being tested are often brought directly from external sources, causing deviations from the standard ruler and leading to inaccurate test results. The longer the steel measuring tape, the greater the deviation. The optimal testing temperature for steel measuring tapes is 20℃. Therefore, there is a need to develop steel measuring tapes with accurate testing results to meet this requirement. Utility Model Content
[0003] To address the above technical problems, this utility model provides a steel tape measure detection device.
[0004] To solve the above technical problems, the technical solution adopted by this utility model is as follows: a steel tape measure testing device, including a testing platform, a groove provided on the testing platform, side sliding grooves opened on both sides of the testing platform, a vernier slidably connected to the side sliding grooves, a first standard size engraved on one side of the testing platform, an auxiliary ruler fixedly connected to the other side of the testing platform, the auxiliary ruler being engraved with the standard size, the coefficient of thermal expansion and contraction of the auxiliary ruler being different from the coefficient of thermal expansion and contraction of the surface of the testing platform, a temperature control box fixedly connected to one side of the testing platform, a cover rotatably connected to the temperature control box, an electric heating wire provided inside the box wall of the temperature control box, an air inlet connected to the bottom of the temperature control box, an electric heating wire provided inside the testing platform, an air duct opened inside the testing platform, an air inlet fixedly connected to the first end of the air duct, an air outlet fixedly connected to the second end, including a cold air fan, the cold air fan being connected to the air inlet and the air inlet respectively through an air pipe and a tee, and temperature probes connected to the surface of the testing platform and inside the temperature control box.
[0005] Furthermore, a retainer is slidably connected to the testing platform, and a spring clip is fixedly connected to the lower part of the retainer.
[0006] Furthermore, the fixture is Π-shaped, with a threaded sleeve on one bottom side and a sliding head on the other side.
[0007] Furthermore, the testing platform has an upper sliding groove on one side and a moving groove on the other side. A threaded rod is rotatably connected in the moving groove, the sliding head is slidably connected to the upper sliding groove, and the threaded sleeve is fitted on the threaded rod.
[0008] Furthermore, a motor is fixedly connected to one end of the testing platform, and the motor's shaft passes through the testing platform and is fixedly connected to the threaded rod.
[0009] Furthermore, a slider is fixedly connected to the bottom of the vernier, and the slider is slidably connected to the side groove.
[0010] Furthermore, an observation slit is provided at the top of the vernier.
[0011] Furthermore, a spring column is fixedly connected to one end of the testing platform, a pressure plate is slidably connected to the spring column, a column cap is fixedly connected to the top of the spring column, and a spring is sleeved between the column cap and the pressure plate.
[0012] Furthermore, a support is fixedly connected to the bottom of the testing station.
[0013] This utility model has the following advantages compared with the prior art:
[0014] 1. This utility model includes a standard size and an auxiliary size. By comparison, it can be confirmed whether the standard size is accurate during testing. A vernier caliper is included to measure the measuring tape under test, resulting in more accurate test results. An electric heating wire and a cooling fan are included to adjust the temperature of the testing platform, maintaining it at 20°C during testing to ensure accuracy. A temperature control box is included to adjust the temperature of the steel measuring tape under test before testing, ensuring that its thermal expansion and contraction matches that of the standard size, thereby reducing errors during testing.
[0015] 2. This utility model is equipped with a fixing device, which is used to move the steel tape measure, resulting in strong stability and saving the manual pulling step when inspecting long steel tape measures. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model.
[0017] Figure 2 This is a side view of the present invention.
[0018] Figure 3 This is a schematic diagram of the air duct structure of this utility model.
[0019] Figure 4 This is a schematic diagram of the vernier structure of this utility model.
[0020] Figure 5This is a schematic diagram of the fixture structure of this utility model.
[0021] Figure 6 This is a schematic diagram of the pressure plate structure of this utility model.
[0022] The components are: 1. Inspection platform, 2. Groove, 3. First standard size, 4. Vernier, 5. Observation slit, 6. Upper slide groove, 7. Fixing device, 8. Air outlet, 9. Temperature control box, 10. Air inlet, 11. Air pipe, 12. Air cooler, 13. T-junction, 14. Auxiliary ruler, 15. Moving groove, 16. Threaded rod, 17. Motor, 18. Pressure plate, 19. Cover, 20. Side slide groove, 21. Bracket, 22. Air duct, 23. Air inlet, 24. Slider, 25. Threaded sleeve, 26. Slider head, 27. Spring clip, 28. Spring column, 29. Spring. Detailed Implementation
[0023] The present invention will be further described below with reference to the accompanying drawings.
[0024] like Figures 1-6 The steel tape measure testing device shown includes a testing platform 1 with a groove 2 and side sliding grooves 20 on both sides. A vernier 4 is slidably connected to the side sliding grooves 20. A first standard size 3 is engraved on one side of the testing platform 1, and an auxiliary ruler 14 is fixedly connected to the other side of the testing platform 1. The auxiliary ruler 14 is made of acrylic plastic and has a standard size engraved on it. The coefficient of thermal expansion and contraction of the auxiliary ruler 14 is different from that of the surface of the testing platform 1. A temperature control box 9 is fixedly connected to one side of the testing platform 1, and a cover 19 is rotatably connected to the temperature control box 9. An electric heating wire is installed inside the box wall of the temperature control box 9. A heating wire is positioned close to the upper surface of the testing platform 1. An air inlet 10 is connected to the bottom of the temperature control box 9. An electric heating wire is installed inside the testing platform 1. An air duct 22 is opened inside the testing platform 1. The first end of the air duct 22 is fixedly connected to the air inlet 23, and the last end is fixedly connected to the air outlet 8. A cooler 12 is included. The cooler 12 is connected to the air inlet 23 and the air inlet 10 through an air pipe 11 and a tee 13, respectively. Temperature probes are connected to both the surface of the testing platform 1 and the inside of the temperature control box 9. The temperature probes are in close contact with the surface of the testing platform 1 and the inner surface of the temperature control box 9. A display is also provided to display the measured temperature. In order to heat evenly, multiple temperature probes are evenly arranged on the testing platform 1.
[0025] At 20℃, the first standard size 3 is the same as the standard size on the auxiliary ruler 14.
[0026] It should be noted that the air cooler 12 is an existing device that can be purchased directly from the market. This utility model only utilizes its cooling function and does not modify its structure. Therefore, its structure will not be described in detail.
[0027] To facilitate the fixing of the steel tape measure, a retainer 7 is slidably connected on the testing table 1, and a spring clip 27 is fixedly connected to the lower part of the retainer 7.
[0028] It should be noted that the spring clip 27 is an existing device that can be directly purchased on the market. This utility model only applies its clamping function and does not change its structure. Therefore, its structure will not be described in detail.
[0029] To ensure stability when the fixture 7 moves, the fixture 7 is Π-shaped, with a threaded sleeve 25 on one bottom side and a slider 26 on the other side.
[0030] To facilitate the movement of the fixing device 7, an upper sliding groove 6 is provided on one side of the testing table 1, and a moving groove 15 is provided on the other side. A threaded rod 16 is rotatably connected in the moving groove 15. The sliding head 26 is slidably connected to the upper sliding groove 6, and the threaded sleeve 25 is fitted on the threaded rod 16.
[0031] In order to achieve automatic movement of the fixture 7, a motor 17 is fixedly connected to one end of the testing table 1. The rotating shaft of the motor 17 passes through the testing table 1 and is fixedly connected to the threaded rod 16.
[0032] To ensure stable movement of the cursor 4, a slider 24 is fixedly connected to the bottom of the cursor 4, and the slider 24 is slidably connected to the side slide groove 20.
[0033] To enable accurate observation, the vernier 4 has an observation slit 5 at its top.
[0034] To prevent the steel measuring tape from slipping during testing, a spring column 28 is fixedly connected to one end of the testing platform 1. A pressure plate 18 is slidably connected to the spring column 28. A column cap is fixedly connected to the top of the spring column 28, and a spring 29 is sleeved between the column cap and the pressure plate 18.
[0035] To stably support the testing platform 1, a bracket 21 is fixedly connected to the bottom of the testing platform 1.
[0036] The specific working process of this utility model is as follows:
[0037] During operation, the temperature of the testing platform 1 is checked first, and the temperature of the steel tape measure to be tested is checked simultaneously using a temperature measuring device. If both temperatures are within 20℃±3℃, the test begins directly. The steel tape measure to be tested is first clamped and stabilized using spring clip 27, and then pulled out and locked onto one side of the testing platform 1. When locking the tape measure head, the pressure plate 18 is pulled open first. After the tape measure is locked, the pressure plate 18 is released, and the spring 29 is used to press the pressure plate 18 to hold the tape measure head down. At this time, the motor 17 is turned on, driving the threaded rod 16 to rotate, thereby driving the threaded sleeve 25 to move, which in turn drives the retainer to move. The steel tape measure is pulled out. During the pulling process, the slider 26 and the upper sliding groove 6 are kept stable. Then the vernier 4 is moved for testing, and the observation slot 5 is used to check whether the steel tape measure is compliant.
[0038] When the temperature of the testing station 1 exceeds the range of 20℃±3℃, first adjust the temperature of the testing station 1. When it is higher than this temperature, turn on the air cooler 12 to send cold air in through the air duct, thereby reducing the temperature of the testing station 1. When the temperature is lower than the above temperature range, turn on the heating wire to heat the testing station 1, and at the same time detect the temperature of the steel tape measure. When the temperature of the steel tape measure exceeds the range of 20℃±3℃, place it in the temperature control box 9 and keep it there for half an hour until its temperature is consistent with the temperature of the testing station 1, and then perform the test.
[0039] The auxiliary ruler 14 is used to calibrate the temperature of the testing station 1. Since the coefficients of thermal expansion and contraction between the two are different, the markings on the first standard ruler 3 and the auxiliary ruler 14 are not the same, which indicates that the temperature detection is inaccurate and the temperature should be re-detected using a handheld temperature detection device.
Claims
1. A steel tape measure testing device, comprising a testing platform (1), wherein the testing platform (1) is provided with a groove (2), and side sliding grooves (20) are provided on both sides of the testing platform (1), wherein a vernier (4) is slidably connected to the side sliding grooves (20), characterized in that: The first standard size (3) is engraved on one side of the detection table (1) of the groove (2), the other side of the detection table (1) is fixedly connected with an auxiliary ruler (14), the standard size is engraved on the auxiliary ruler (14), the thermal expansion and contraction coefficient of the auxiliary ruler (14) is different from the thermal expansion and contraction coefficient of the surface of the detection table (1), one side of the detection table (1) is fixedly connected with a temperature control box (9), the temperature control box (9) is rotatably connected with a cover (19), the box wall of the temperature control box (9) is provided with an electric heating wire, the bottom of the temperature control box (9) is communicated with an air inlet nozzle (10), the detection table (1) is provided with an electric heating wire, the detection table (1) is provided with an air duct (22), the first end of the air duct (22) is fixedly connected with an air inlet (23), the tail end is fixedly connected with an air outlet (8), including a cold air blower (12), the cold air blower (12) is communicated with the air inlet (23) and the air inlet nozzle (10) through the air pipe (11) and the three-way (13) respectively, the surface of the detection table (1) and the temperature control box (9) are both connected with a temperature probe.
2. The tape measure detection apparatus of claim 1, wherein: The detection table (1) is slidably connected with a fixer (7), and the lower part of the fixer (7) is fixedly connected with a spring clamp (27).
3. The tape measure detection apparatus of claim 2, wherein: The fixer (7) is Π-shaped, one side of the bottom is a threaded sleeve (25), and the other side is a sliding head (26).
4. The tape measure detection apparatus of claim 3, wherein: One side of the detection table (1) is provided with an upper sliding groove (6), and the other side is provided with a moving groove (15), the moving groove (15) is rotatably connected with a threaded rod (16), the sliding head (26) is slidably connected with the upper sliding groove (6), and the threaded sleeve (25) is sleeved on the threaded rod (16).
5. The tape measure testing apparatus of claim 4, wherein: One end of the detection table (1) is fixedly connected with a motor (17), the rotating shaft of the motor (17) penetrates the detection table (1) and is fixedly connected with the threaded rod (16).
6. The tape measure testing apparatus of claim 1, wherein: The bottom of the vernier (4) is fixedly connected with a sliding block (24), and the sliding block (24) is slidably connected with the side sliding groove (20).
7. The tape measure testing apparatus of claim 1, wherein: The top of the vernier (4) is provided with an observation slot (5).
8. The tape measure detection apparatus of claim 1, wherein: One end of the detection table (1) is fixedly connected with a spring column (28), the spring column (28) is slidably connected with a pressing plate (18), the top end of the spring column (28) is fixedly connected with a column cap, and the column cap is sleeved with a spring (29) between the pressing plate (18).
9. The tape measure detection apparatus of claim 1, wherein: The bottom of the detection table (1) is fixedly connected with a support (21).